What is JSP?
What is JSP?- JSP is a technology that returns dynamic content to the Web client using HTML, XML and JAVA elements. - JSP page looks like a HTML page but is a servlet. - It contains Presentation logic and business logic of a web application. - A JSP page is a text document that contains two types of text: static data, which can be expressed in any text-based format (such as HTML, SVG, WML, and XML), and JSP elements, which construct dynamic content. - The file extension for the source file of a JSP page is .jsp. It can be composed of a top file that includes other files that contain either a complete JSP page or a fragment of a JSP page. - The recommended extension for the source file of a fragment of a JSP page is .jspf. - The JSP elements in a JSP page can be expressed in two syntaxes, standard and XML, though any given file can use only one syntax. - A JSP page in XML syntax is an XML document and can be manipulated by tools and APIs for XML documents.
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What is co-variant return type in java?A covariant return type allows to override a super class method that returns a type that sub class type of super class method’s return type. It is to minimize up casting and down casting......
Define collable collections in javaA callable collection is an interface whose implementers define a single method with no arguments. The Callable interface resembles Runnable..